mmdet错误：SyntaxError: invalid syntax

mmdet运行时提示：

Traceback (most recent call last):
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/site-packages/mmcv/utils/config.py", line 100, in _validate_py_syntax
    ast.parse(content)
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/ast.py", line 35, in parse
    return compile(source, filename, mode, PyCF_ONLY_AST)
  File "<unknown>", line 1
    /home/ubuntu/bigdisk/part1/xxxx.py
    ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "train.py", line 171, in <module>
    main()
  File "train.py", line 167, in main
    meta=meta)
  File "/home/ubuntu/bigdisk/part1/test/xxx/tools/../mmdet/apis/train.py", line 111, in train_detector
    meta=meta)
  File "/home/ubuntu/bigdisk/part1/test/xxx/tools/../mmdet/apis/train.py", line 238, in _non_dist_train
    runner.resume(cfg.resume_from)
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/site-packages/mmcv/runner/base_runner.py", line 375, in resume
    checkpoint['meta']['config'], file_format='.py')
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/site-packages/mmcv/utils/config.py", line 344, in fromstring
    cfg = Config.fromfile(temp_file.name)
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/site-packages/mmcv/utils/config.py", line 316, in fromfile
    use_predefined_variables)
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/site-packages/mmcv/utils/config.py", line 204, in _file2dict
    Config._validate_py_syntax(filename)
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/site-packages/mmcv/utils/config.py", line 102, in _validate_py_syntax
    raise SyntaxError('There are syntax errors in config '
SyntaxError: There are syntax errors in config file /tmp/tmpaa48liz2.py: invalid syntax (<unknown>, line 1)
Exception ignored in: <bound method _TemporaryFileCloser.__del__ of <tempfile._TemporaryFileCloser object at 0x7f57cc7e6c50>>
Traceback (most recent call last):
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/tempfile.py", line 452, in __del__
    self.close()
  File "/home/ubuntu/anaconda3/envs/test/lib/python3.6/tempfile.py", line 448, in close
    unlink(self.name)
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmp3c8qqk_p/tmp1kje07dp.py'

解决方法：

这种一般是两个原因：

1，转换模型的时候出现的问题，比如升级模型的时候，这时，只需要修改：

    out_state_dict = OrderedDict()
    meta_info = checkpoint['meta']
    is_two_stage, is_ssd, is_retina, reg_cls_agnostic = parse_config(
        meta_info['config'])
    if meta_info['mmdet_version'] <= '0.5.3' and is_retina:
        upgrade_retina = True
    else:

将 meta_info['config'])改成：'#' + meta_info['config'])即可

2，mmcv版本的问题

高版本的mmcv会出现这个问题，只需要降级即可。

pip install mmcv==1.1.2